I bought an LG 55″ LED 1080p 120Hz TV on Amazon (excellent experience) three years ago for something like $1,600, a decent deal at the time. Similar sets (same manufacturer, same specs, different model) go for $900 now. I am and have been ecstatically happy with this TV, so I’m not beating myself up over it.

IMO, you shouldn’t skimp (or obsess over cost) on the things you spend the most time with – bed, TV, car, phone.